Bayer, the manufacturer of agriculture pesticides proven to be killing honey bees, has also discovered and marketed propoxur, a known neurotoxin and carcinogen, in over-the-counter flea & tick collars and flea and tick drops.

Last month, PetSmart, PETCO, and 16 other pet product retailers and manufacturers settled a lawsuit in California, brought by the Natural Resources Defense Council, agreeing not to distribute or sell flea collars containing propoxur without warning

In California, 18 pet product retailers and manufacturers agreed, as part of a lawsuit settlement, to add a warning label to flea and tick collars clearly stating: "This product contains propoxur, a chemical known to the State of California to cause